Koss CS95 Speech Recogniton Computer Headset Dynamic Element Delivers High Sensitivity Reduced Distortion For Premium Sound At All Volume Levels Frequency Response: 30Hz-16Khz Connectivity technology : Wired Frequency Response : Stereophone: 30-16,000 Hz, Microphone: 100-16,000 Hz Impedance: Stereophone: 32 ohms, Microphone: Same as load resistance Sensitivity: Stereophone: 91 dB SPL/1mW, Microphone: -56dB +/- 3dB per 1V/1KHz); (-36dB +/- 3dB, V/Pa) Distortion: Stereophone: &lt;1.0% Cord: Straight, Single Entry, 8ft